You should keep in mind that the farther you deviate from a standard installation the less support you will get from Directv Techs if there is a problem. You would most likely be left to sort the issue out yourself or hire a third party.
The newer receivers H25's and clients have wall mounts designed to go behind flat screens to keep them out of sight. They also use RF Remotes.
That's good to know.. So Far I have purchased 3 of the RVU tvs, however , i did not know they have mountable RF receivers.